# RHSA-2021:2264: thunderbird security update

RHSA-2021:2264, released June 7, 2021, fixes 3 CVEs in thunderbird (version 0:78.11.0-1.el8_4). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2021-2264
- Platform: Linux
- Released: Jun 7, 2021
- Priority: High (Closes CVE-2021-29967, high severity)
- CVEs: 3, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2021:2264

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [thunderbird](https://patchblox.com/security/data/product/linux/thunderbird.md) | RHEL 8 | 0:78.11.0-1.el8_4 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-29967](https://patchblox.com/security/data/cve/CVE-2021-29967.md) | High | Firefox ESR and 3 others: Mozilla developers reported memory safety bugs present in Firefox 88 and Firefox ESR 78.11. | 8.8 | 0.0137 |  |
| [CVE-2021-29957](https://patchblox.com/security/data/cve/CVE-2021-29957.md) | Routine | Thunderbird and 1 other: If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but also contains… | 4.3 | 0.0094 |  |
| [CVE-2021-29956](https://patchblox.com/security/data/cve/CVE-2021-29956.md) | Routine | Mozilla Thunderbird: OpenPGP secret keys that were imported using Thunderbird version 78.8.1 up to version 78.10.1 were stored… | 4.3 | 0.0081 |  |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo